The Radial Engineering BigShot ABY Passive Switcher toggles between 2 guitar amps. Or use the BigShot to play them both at the same time. Offers a guitar input, a thru-put, and 2 outputs. Output B has a ground-lift and 180 polarity reverse. For active buffered circuits, The BigShot ABY Passive Switcher eliminated ground loops with an isolation transformer on output-B. 14-gauge steel construction.Please message us if you have any questions.